Add support for memswap_limit

[Mart-Bogdan]

Currently Swap related options of standalone docker aren't available in Swarm Mode.

Docker compose supports top level(under service) element of memswap_limit, but using it with stack deploy causes error:

memswap_limit: Set resource limits using deploy.resources

and resources section doesnt's support either top level elements memswap_limit nor memswap.

I've tried it in deploy.resources.limits as well, but no success:

services.my_srv.deploy.resources.limits Additional property memswap is not allowed

Related to this closed(but not fixed) issue docker/compose#7594 (comment)